an anatomical structure used as a point of origin in locating other anatomical structures (as in surgery) or as point from which measurements can be taken
a mark showing the boundary of a piece of land
an event marking a unique or important historical change of course or one on which important developments depend; "the agreement was a watershed in the history of both nations"
the position of a prominent or well-known object in a particular landscape; "the church steeple provided a convenient landmark"
the act of noticing or paying attention; "he escaped the notice of the police"
polite or favorable attention; "his hard work soon attracted the teacher's notice"
a short critical review; "the play received good notices"
an announcement containing information about a future event; "you didn't give me enough notice"
advance notification (usually written) of the intention to withdraw from an arrangement or contract; "we received a notice to vacate the premises"; "he gave notice two months before he moved"
express recognition of the presence or existence of, or acquaintance with; "He never acknowledges his colleagues when they run into him in the hallway"; "She acknowledged his complement with a smile"; "it is important to acknowledge the work of others in one's own writing"
notice or perceive; "She noted that someone was following her"; "mark my words"
fraught with danger; "dangerous waters"; "a parlous journey on stormy seas"; "a perilous voyage across the Atlantic in a small boat"; "the precarious life of an undersea diver"; "dangerous surgery followed by a touch-and-go recovery"